Biaxially oriented laminated polyester film

Details Biaxially oriented laminated polyester film Biaxially oriented laminated polyester film

1994-11-10

1996-06-25

Sluby, P. C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428331, 428332, 428483, 428694SL, 428906, 428910, 428900, G11B 2300, G11B 5704, B32B 2736

Patent

active

055298320

ABSTRACT:
A biaxially oriented laminated polyester film comprising a first polyester surface layer having (a1) a central line average roughness R.sub.aA of 1 to 7.9 nm, (b1) a 10-points average roughness R.sub.ZA of 15 to 400 nm and (c1) an R.sub.ZA /R.sub.aA ratio of 11-51, and a second polyester surface layer having (a2) a central line average roughness R.sub.aB which is greater than R.sub.aA and is 5 to 40 nm, (b2) a 10-points average roughness R.sub.ZB of 75 to 600 nm and (c2) an R.sub.ZB /R.sub.aB ratio of 20 or less, and satisfying the relationship between the first polyester surface layer and the second polyester surface layer, which is represented by the following expressions,

REFERENCES:
patent: 5093208 (1992-03-01), Heyes et al.
patent: 5106681 (1992-04-01), Endo et al.
AB-85-293477/47 for JP 2081806-B.
W. Goerlitz, et al., Journal of Magnetism and Magnetic Materials, 120 (1993) Mar. I, No. 1/3, pp. 76-82.
Japanese Patent Abstracts (Examined) Week 9506, Derwent Publications, Ltd., AN 95-040815 (& JP-A-6 320 691, Nov. 22, 1994).
English language abstract of EP 257,611.

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